Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 107 · 40 questions

What you do (Yeast is alive): 1. Pour warm (not hot) water into the bottle — an adult checks it. 2. Add the yeast and the sugar and swirl gently. 3. Stretch the balloon over the bottle’s mouth. 4. Wait 30 minutes, measure the balloon, then pour the mixture away and wash up.

1. 1.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is the one thing we change. (a) False (b) True
2. 2.True or false: a paper clip is not needed for the yeast balloon. (a) True (b) False
3. 3.🔍 Which is the odd one out? (a) time (b) sugar (c) vinegar (d) warm water
4. 4.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it
5. 5.🔍 Which is the odd one out? (a) a magnet (b) salt (c) sugar (d) sunlight
6. 6.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
7. 7.True or false: turmeric powder is needed for the yeast balloon. (a) True (b) False
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of sugar”? (a) we change it (b) we measure it (c) we keep it the same
9. 9.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) sugar (c) dry yeast (d) turmeric powder
10. 10.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a balloon (c) a comb (d) sugar
11. 11.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) dry yeast (c) a paper clip (d) a battery cell
12. 12.🧺 Which of these is needed for the yeast balloon? (a) sugar (b) a magnet (c) turmeric powder (d) a battery cell
13. 13.True or false: warm water is something yeast does not need. (a) True (b) False
14. 14.True or false: warm water is something yeast needs. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) time (b) warm water (c) sugar (d) sunlight
16. 16.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of sugar is what we measure. (a) True (b) False
17. 17.🍞 Does yeast need time to make gas? (a) yeast needs it (b) yeast does not need it
18. 18.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it grows very little (b) it grows much faster (c) it bursts at once (d) it turns yellow
19. 19.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the water temperature”? (a) we keep it the same (b) we change it (c) we measure it
20. 20.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a battery cell (d) warm water
21. 21.🧺 Which of these is not needed for the yeast balloon? (a) warm water (b) a mirror (c) dry yeast (d) a small bottle
22. 22.True or false: a paper clip is needed for the yeast balloon. (a) False (b) True
23. 23.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a paper clip (b) warm water (c) a small bottle (d) dry yeast
24. 24.🍞 Why does yeast work slowly in cold water? (a) cold water is heavy (b) cold makes it pink (c) cold slows yeast down (d) cold kills sugar
25. 25.🧺 Which of these is not needed for the yeast balloon? (a) sugar (b) a battery cell (c) warm water (d) a small bottle
26. 26.🛟 The water for the yeast should be ___. (a) warm, not hot (b) very salty (c) ice cold (d) boiling hot
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) True (b) False
28. 28.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
29. 29.True or false: sugar is something yeast does not need. (a) True (b) False
30. 30.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it shrinks to nothing (b) it turns to bread (c) the balloon is smaller (d) the balloon is bigger
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) False (b) True
32. 32.True or false: turmeric powder is not needed for the yeast balloon. (a) False (b) True
33. 33.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it grows faster (b) it turns to sugar (c) it glows (d) the yeast is killed
34. 34.True or false: dry yeast is needed for the yeast balloon. (a) False (b) True
35. 35.🛟 After the yeast experiment, what should you do with the mixture? (a) pour it down the sink (b) keep it for a month (c) throw it at a wall (d) put it in your mouth
36. 36.🧺 Do we need a small bottle for the yeast balloon? (a) needed (b) not needed
37. 37.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we keep it the same (b) we measure it (c) we change it
38. 38.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) a mirror (c) sugar (d) warm water
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we change it (b) we keep it the same (c) we measure it
40. 40.🧺 Do we need a battery cell for the yeast balloon? (a) needed (b) not needed

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